Combustion furnace and control method

Abstract

The present invention belongs to the technical field of combustion furnaces, and specifically relates to a combustion furnace and a control method, comprising a furnace body, a circulation fan and a gas supply source are installed on one side of the furnace body, the circulation fan is connected to a motor, the circulation fan mixes the input gas with oxygen, two rows of gas delivery pipes are arranged on the inner peripheral side wall of the furnace body, the gas enters from one end of the upper gas delivery pipe, and then is sent to the lower gas delivery pipe through the other end, so that after the gas is preheated inside, it is sent into the combustion device through the lower gas delivery pipe, which can further improve its combustion efficiency, a combustion device is arranged on the other side of the furnace body, the gas delivery pipe is connected to the combustion device, the combustible gas is burned in the combustion device, and an ignition device is arranged in the combustion device; a control pipe assembly is installed on the other side of the furnace body.

Description

Technical Field

[0001] The invention relates to the technical field of combustion furnaces, and in particular to a combustion furnace and a control method thereof. Background Art

[0002] In the prior art, conventional combustion furnaces used in industry mainly include a combustion furnace body, a combustion chamber is formed inside the body, the upper end of the combustion chamber is a flame opening, and the lower end is connected to a gas source or a fuel source. When in use, the valve is opened, and the fuel is transported into the combustion chamber, and the fuel and air are mixed and burned in the combustion chamber. The burning flame radiates through the flame opening to the material to be heated in the industrial furnace, heating or melting the material.

[0003] For example, the Chinese invention, patent number CN200720088655.4, discloses an electronically ignited burner for a blast furnace top ignition device, which is composed of a combustible gas pipeline and a combustion-supporting gas pipeline. The pipe openings of the combustible gas pipeline and the combustion-supporting gas pipeline lead to a mixed combustion chamber, and an electronically ignited spark nozzle is installed in the mixed combustion chamber, or an electronically ignited spark nozzle is installed at the pipe opening of the mixed combustion chamber. The nozzle is connected to a conductive rod, and the other end of the conductive rod passes through the burner and is connected to one end of a high-voltage cable, and the other end of the high-voltage cable is connected to the electronic ignition device. When working, the electronic ignition device generates high voltage electricity, which generates electric sparks at the spark nozzle after passing through the high-voltage cable and the conductive rod, igniting the combustible gas in the mixed combustion chamber.

[0004] In the existing combustion furnace, when the ignition device ignites multiple times but fails to ignite the gas, the gas is still being released, so when it is ignited next time, the furnace is prone to flash explosion, which leads to poor safety. Therefore, the structure needs to be further improved. Summary of the invention

[0005] The purpose of the present invention is to provide a combustion furnace and a control method, which can solve the existing problem of low safety through a new structural design in the combustion furnace.

[0006] The objective of the present invention is achieved in this way: a combustion furnace comprises a furnace body, a circulation fan and a gas supply source are installed on one side of the furnace body, the circulation fan is connected to a motor, a gas delivery pipeline is arranged on the inner peripheral side wall of the furnace body, a combustion device is arranged on the other side of the furnace body, the gas delivery pipeline is communicated with the combustion device, combustible gas burns in the combustion device, the combustion device comprises a mixing chamber and a combustion chamber, the mixing chamber and the combustion chamber are connected by a plurality of air supply pipes, a gas connecting pipeline is arranged on the mixing chamber, the combustion chamber comprises a main board, a side board and a top board, a gas cavity is formed between the two main boards, the two sides of the two main boards are respectively connected to the side boards, mounting holes for mounting an ignition device are provided on the side boards, a top board is installed on the upper end of the main board, a plurality of evenly arranged ventilation holes are provided on the top board, the ventilation holes are communicated with the air supply pipe, a plurality of evenly arranged gas holes are provided on the main board, the diameter of the gas holes close to the top board is smaller than the diameter of the gas holes far from the top board;

[0007] The ignition device comprises a main body mounting seat, the main body mounting seat is connected to an oxygen delivery pipe, an ignition pipe and a flame detection pipe are respectively installed in the main body mounting seat, one end of the ignition pipe is connected to an electronic ignition device, and the other end of the ignition pipe is provided with an ignition needle, a gas delivery pipe is arranged in the main body mounting seat, a gas mixing honeycomb is installed at the end of the gas delivery pipe, and the gas mixing honeycomb is arranged in the oxygen delivery pipe;

[0008] A control pipeline assembly is installed on the other side of the furnace body, and the control pipeline assembly includes a main gas pipeline and a subsidiary gas pipeline. One end of the main gas pipeline is provided with an input interface for external gas, and the other end of the main gas pipeline is connected to one end of the subsidiary gas pipeline and is provided with a common output interface. The common output interface is connected to the gas connecting pipeline through pipeline 1. A ventilation pipeline is connected between the middle part of the main gas pipeline and the middle part of the subsidiary gas pipeline. A main valve switch is provided at one end of the main gas pipeline, and a high fire switch is provided at the other end of the main gas pipeline. A low fire switch is provided on the subsidiary gas pipeline, and the low fire switch is located between the common output interface and the ventilation pipeline.

[0009] Preferably, a mixing cavity is formed in the gas mixing honeycomb body, and a plurality of ventilation holes 1 are respectively provided on the end faces of both sides of the gas mixing honeycomb body, and one end of the fuel gas delivery pipe is connected to the gas mixing honeycomb body; a gas mixing plate is also provided in the oxygen delivery pipe, and the gas mixing plate is located on one side of the gas mixing honeycomb body, and a plurality of ventilation holes 2 are provided on the gas mixing plate.

[0010] Preferably, one end of the ignition pipe passes through and is connected to the gas mixing honeycomb body and the gas mixing sheet; a gas connector is provided on the main body mounting seat, the gas connector is connected to the gas delivery pipe, an oxygen inlet hole is provided on the main body mounting seat, an oxygen outlet cavity is formed in the main body mounting seat, and the oxygen outlet cavity is connected to the oxygen delivery pipe.

[0011] Preferably, an ignition joint and a flame detection joint are provided on the main body mounting seat, one end of the ignition joint is connected to the ignition needle, the other end of the ignition joint is connected to the electronic ignition device, one end of the flame detection joint is connected to the flame detection pipe, and the other end of the flame detection joint is connected to the control detection cabinet; a visual window is provided on the main body mounting seat; the ignition pipe, gas delivery pipe and flame detection pipe are arranged inside the oxygen delivery pipe.

[0012] Preferably, the other end of the auxiliary gas small pipeline is connected to pipeline 2, and the other end of pipeline 2 is connected to the ignition device in the furnace body; a normally open gas switch is arranged between the other end of the auxiliary gas small pipeline and pipeline 2; and a manual valve 5 is arranged between the other end of the auxiliary gas small pipeline and pipeline 2.

[0013] Preferably, a manual valve 1 is provided at one end of the main gas pipeline, a manual valve 2 is provided at the other end of the main gas pipeline, and a manual valve 3 is provided on the auxiliary gas pipeline, and the manual valve 3 is located between the public output interface and the ventilation pipeline.

[0014] Preferably, an oxygen delivery machine is also included, and the oxygen delivery machine is respectively provided with an input port and an output port for external input of oxygen, and the output port is connected with the pipeline one through the pipeline three.

[0015] Preferably, one end of the pipeline three is connected to a three-way valve, one end of the three-way valve is connected to the pipeline one, the other end of the three-way valve is connected to the pipeline four, and the other end of the pipeline four is connected to the ignition device in the furnace body; a manual valve four is arranged between the pipeline three and the pipeline one; the low fire switch, high fire switch and main valve switch are solenoid valves.

[0016] Preferably, the gas hole includes a first gas hole and a second gas hole, the first gas hole is located at the upper end of the main board, the second gas hole is located at the lower end of the main board, the diameter of the first gas hole is smaller than the diameter of the second gas hole, and the second gas hole includes a large hole and a small hole; the lower end of the main board is inclined outward, and an opening for gas outlet is formed at the lower end of the main board.

[0017] Preferably, the inclination angle of the main board is 30°-50°; ventilation plates are installed on both sides of the top plate, and a plurality of air holes are opened on the ventilation plates; an outer cover shell is also included, and the upper and lower ends of the outer cover shell are both openings. The outer cover shell is arranged on the periphery of the mixing chamber and the combustion chamber, and the ventilation plate is located between the outer cover shell and the top plate.

[0018] A control method, with a PLC, when:

[0019] The circulating fan fails, X6 is connected, all PLC outputs lose power and stop working;

[0020] The ignition fan fails, X7 is connected, all PLC outputs lose power and stop working;

[0021] When the inverter fails, all PLC outputs lose power and stop working;

[0022] When working normally, the flame detection connector does not detect the flame signal, the PLC outputs all lose power and stop working.

[0023] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0024] 1. The present invention designs the gas holes in the combustion device so that the diameter of the gas holes near the top plate is smaller than that of the gas holes far from the top plate, so that most of the gas can be discharged through the gas holes at the lower end, which is closer to the fire source and burns more fully. The second gas hole includes a large hole and a small hole. The diameters of the two holes are different and will not form an impact, which can prevent resonance and reduce noise.

[0025] 2. The present invention controls the design of the flame detection pipe in the pipe assembly. When the gas is not ignited after multiple ignitions, the control detection cabinet will detect the signal through the flame detection joint and close the combustible gas delivery pipeline to prevent flash explosion caused by re-ignition due to excessive internal combustible gas concentration, thereby improving safety.

[0026] 3. The present invention adopts the design of the honeycomb body in the ignition device. When oxygen and fuel gas are transported from the outside to the inside of the ignition device, oxygen will first enter the gas mixing honeycomb body 8 through the oxygen delivery pipe, and at the same time, fuel gas will enter the gas mixing honeycomb body through the fuel gas delivery pipe, so that oxygen and fuel gas are preliminarily mixed in the gas mixing honeycomb body to facilitate subsequent ignition and reduce the probability of ignition failing to ignite the mixed gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the combustion furnace.

[0028] Figure 2 Schematic diagram of the internal structure of the combustion furnace.

[0029] Figure 3 This is a schematic diagram of the structure of the combustion device.

[0030] Figure 4 It is a structural diagram of the main board and top plate.

[0031] Figure 5 Schematic diagram of the structure for installing the outer cover shell for the combustion device.

[0032] Figure 6 It is a schematic diagram of the side structure of the combustion device.

[0033] Figure 7 This is a schematic diagram of the structure when the main mounting base is connected to the oxygen delivery tube.

[0034] Figure 8 This is a schematic diagram of the structure after the oxygen delivery tube is removed from the main mounting base.

[0035] Fig. 9 The structure diagram of the main mounting base Figure 1 .

[0036] Fig.10 It is a schematic diagram of the installation structure of the gas mixing honeycomb body and the gas mixing sheet.

[0037] Fig.11 The structure diagram of the main mounting base Figure 2 .

[0038] Fig.12 This is a schematic diagram of the structure of the gas valve control pipeline.

[0039] Fig.13 It is a schematic diagram of the structure of the circulation fan, ignition fan and variable frequency fan.

[0040] Fig.14 It is a structural diagram of the PLC controller.

[0041] Fig.15 This is a schematic diagram of the connection between the intermediate relay and components.

[0042] Figure numerals: 1-mixing chamber; 2-combustion chamber; 3-air delivery pipe; 4-gas connecting pipe; 5-main board; 6-side board; 7-top board; 9-mounting hole; 10-vent hole; 11-gas hole; 12-first gas hole; 13-second gas hole; 14-large hole; 15-small hole; 16-vent plate; 17-gas hole; 18-outer cover shell; 21-main body mounting seat; 22-oxygen delivery pipe; 23-ignition pipe; 24-flame detection pipe; 25-gas connector; 26-ignition needle; 27-gas delivery pipe; 28-gas mixing honeycomb; 30-vent hole one; 31-gas mixing plate; 32-vent hole two; 33-oxygen inlet hole; 34-oxygen outlet cavity; 35-ignition connector; 36-flame detection joint; 37-visual window; 41-main gas pipeline; 42-auxiliary gas pipeline; 43-input interface; 44-public output interface; 45-pipeline one; 47-ventilation pipeline; 48-main valve switch; 49-high fire switch; 50-low fire switch; 51-pipeline two; 52-ignition device; 53-normally open gas switch; 54-manual valve one; 55-manual valve two; 56-manual valve three; 57-oxygen delivery machine; 58-input port; 59-output port; 60-pipeline three; 61-three-way valve; 62-pipeline four; 63-manual valve four; 64-manual valve five; 70-furnace body; 71-gas transmission pipeline; 72-combustion device; 73-control pipeline assembly. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1-12 The specific implementation modes of the present invention are described in further detail.

[0044] Combination Figure 1 and Figure 2 A combustion furnace includes a furnace body 70, one side of the furnace body 70 is equipped with a circulation fan and a gas supply source, the circulation fan is connected to a motor, the circulation fan mixes the input gas with oxygen, and two rows of gas delivery pipes 71 are arranged on the inner peripheral side wall of the furnace body 70. The gas enters from one end of the upper gas delivery pipe 71 and is then sent to the lower gas delivery pipe 71 through the other end. Therefore, after the gas is preheated inside, it is sent to the combustion device 72 through the lower gas delivery pipe 71, which can further improve its combustion efficiency.

[0045] Combination Figure 3 and Figure 6A combustion device 72 is provided on the other side of the furnace body 70. A gas delivery pipeline 71 is connected to the combustion device 72, and then the gas is delivered into the combustion device 72 through the gas delivery pipeline 71. The combustible gas burns in the combustion device 72. The combustion device 72 includes a mixing chamber 1 and a combustion chamber 2. The mixing chamber 1 and the combustion chamber 2 are connected by a plurality of air delivery pipes 3. A gas connecting pipeline 4 is provided on the mixing chamber 1. In the actual combustion process, the gas first enters the mixing chamber 1 through the gas connecting pipeline 4 to mix with oxygen for subsequent ignition and combustion. Among them, the mixing chamber 1 and the combustion chamber 2 are connected by a plurality of air delivery pipes 3, and the mixed gas is delivered into the combustion chamber 2 through the air delivery pipe 3 for ignition.

[0046] Combination Figure 3-Figure 6 The combustion chamber 2 includes two main boards 5, two side boards 6 and a top board 7. A gas cavity is formed between the two main boards 5. The two sides of the two main boards 5 are respectively connected to the side boards 6. The side boards 6 are provided with mounting holes 9 for installing an ignition device 52. The end of the ignition device 52 is located in the gas cavity. The gas in the gas cavity is ignited by the ignition device 52. The top board 7 is installed on the upper end of the main board 5. A plurality of evenly arranged vents 10 are provided on the top board 7. The vents 10 are connected to the air supply pipe 3, so that the gas in the mixing chamber 1 is evenly delivered to the combustion chamber 2 through the vents 10 for ignition. A plurality of evenly arranged gas holes 11 are provided on the main board 5. The diameter of the gas holes 11 near the top board 7 is smaller than the diameter of the gas holes 11 far from the top board 7, so that most of the gas can be discharged through the gas holes 11 at the lower end, which is closer to the fire source and burns more fully.

[0047] Combination Figure 7-Figure 11 The ignition device includes a main body mounting seat 21, a gas delivery pipe 27 is arranged in the main body mounting seat 21, a gas connector 25 is provided on the main body mounting seat 21, the gas connector 25 is connected to the gas delivery pipe 27, the gas connector 25 is used to connect to an external gas delivery device, that is, pipeline 51, so as to increase the gas required for ignition for the ignition device 52, the main body mounting seat 21 is connected to an oxygen delivery pipe 22, the main body mounting seat 21 is provided with an oxygen inlet hole 33, the oxygen inlet hole 33 is used to connect to an external oxygen delivery device, that is, pipeline 62, an oxygen outlet cavity 34 is formed in the main body mounting seat 21, the oxygen outlet cavity 34 is connected to the oxygen delivery pipe 22, firstly, the gas and oxygen are sent into the ignition device together to facilitate the next step of ignition and combustion.

[0048] An ignition pipe 23 and a flame detection pipe 24 are respectively installed in the main body mounting seat 21. One end of the ignition pipe 23 is connected to an electronic ignition device, and the other end of the ignition pipe 23 is provided with an ignition needle 26. The electronic ignition device is used to make the ignition needle generate high voltage, thereby generating an electric spark, so as to ignite the gas and smoke mixed gas. A gas mixing honeycomb 28 is installed at the end of the gas delivery pipe 27. The gas mixing honeycomb 28 is arranged in the oxygen delivery pipe 22. When oxygen and gas are transported from the outside to the inside of the ignition device, oxygen will first enter through the oxygen delivery pipe 22. To the gas mixing honeycomb 28, and at the same time, the fuel gas will enter the gas mixing honeycomb 28 through the fuel gas delivery pipe 27, so that the oxygen and fuel gas are preliminarily mixed in the gas mixing honeycomb 28 to facilitate subsequent ignition and reduce the probability of ignition and failure to ignite the mixed gas. A flame detection sensor is arranged in the flame detection pipe 24. The flame detection sensor is used to detect whether the fuel gas in the boiler is ignited when the electronic ignition device is working. If the gas is still not ignited within the set number of ignitions, the fuel gas will stop being delivered to prevent flash explosion and improve safety.

[0049] Combination Fig.12 A control pipeline assembly 73 is installed on the other side of the furnace body 70. The control pipeline assembly 73 includes a main gas pipeline 41 and a secondary gas pipeline 42. One end of the main gas pipeline 41 is provided with an input interface 43 for external gas. The other end of the main gas pipeline 41 is connected to one end of the secondary gas pipeline 42 and is provided with a common output interface 44. The common output interface 44 is connected to the gas connecting pipeline 5 through a pipeline 1 45, so as to transport the gas to the combustion device 72 in the furnace body 70.

[0050] A ventilation pipe 47 is connected between the middle part of the main gas pipeline 41 and the middle part of the auxiliary gas pipeline 42. A main valve switch 48 is provided at one end of the main gas pipeline 41. The main valve switch 48 can be used to shut off the gas inlet, thereby stopping the continued intake of gas into the furnace body 70. A high fire switch 49 is provided at the other end of the main gas pipeline 41. A low fire switch 50 is provided on the auxiliary gas pipeline 42. The low fire switch 50 is located between the common output interface 44 and the ventilation pipe 47.

[0051] In actual operation, only one of the high fire switch 49 and the low fire switch 50 is in the on state, and the other switch is in the off state. When the high fire switch 49 is turned on and the low fire switch 50 is turned off, the gas will enter the furnace body 70 through the main gas large pipeline 41. When the low fire switch 50 is turned on and the high fire switch 49 is turned off, the gas will enter the furnace body 70 through the main gas large pipeline 41, the ventilation pipeline 47, and the auxiliary gas small pipeline 42. Since the diameter of the main gas large pipeline 41 is larger than the diameter of the auxiliary gas small pipeline 42, the gas output of the two pipelines is different, thereby realizing the control of large and small fires.

[0052] Combination Figure 7-Figure 11 A mixing cavity is formed in the gas mixing honeycomb body 28, and the gas outlets of the gas delivery pipe 27 and the oxygen delivery pipe 22 are respectively connected to the mixing cavity. A plurality of air vents 30 are respectively provided on the end faces of both sides of the gas mixing honeycomb body 28. The design of the plurality of air vents 30 can improve the mixing effect and make the gas mixing more uniform, thereby improving its combustion efficiency. One end of the gas delivery pipe 27 is connected to the gas mixing honeycomb body 28.

[0053] A gas mixing plate 31 is also provided in the oxygen delivery pipe 22. The gas mixing plate 31 is located on one side of the gas mixing honeycomb body 28. A plurality of ventilation holes 32 are provided on the gas mixing plate 31. Through the design of the gas mixing plate 31, the fuel gas and oxygen will be further mixed when passing through the ventilation holes 32, thereby improving the completeness of their combustion.

[0054] One end of the ignition pipe 23 passes through and is connected to the gas mixing honeycomb 28 and the gas mixing sheet 31. The connection structure is simple and easy to produce.

[0055] An ignition connector 35 and a flame detection connector 36 are provided on the main body mounting base 21. One end of the ignition connector 35 is connected to the ignition needle 26, and the other end of the ignition connector 35 is connected to an electronic ignition device. The electronic ignition device is a prior art and is used to make the ignition needle 26 generate sparks, thereby igniting the combustible gas. Therefore, its structure is not described in detail in this article. One end of the flame detection connector 36 is connected to the flame detection pipe 24, and the other end of the flame detection connector 36 is connected to the control detection cabinet. When the gas is not ignited after multiple ignitions, the control detection cabinet will detect the signal through the flame detection connector 36 and close the combustible gas delivery pipeline to prevent flash explosion caused by re-ignition after the internal combustible gas concentration is too high, thereby improving safety.

[0056] The main body mounting seat 21 is provided with a visual window 37 , through which the internal conditions of the ignition device can be observed, making observation convenient.

[0057] The ignition pipe 23, the fuel gas delivery pipe 27, and the flame detection pipe 24 are arranged inside the oxygen delivery pipe 22, which can protect the structure and reduce the occupied space.

[0058] Combination Fig.12 The other end of the auxiliary gas small pipeline 42 is connected to the pipeline 2 51, and the other end of the pipeline 2 51 is connected to the ignition device 52 in the furnace body 70, so as to increase the gas required for ignition of the ignition device 52. A normally open gas switch 53 is provided between the other end of the auxiliary gas small pipeline 42 and the pipeline 2 51. Therefore, while the gas is transported into the furnace body 70, the gas will continue to be transported into the ignition device 52, so that the ignition device 52 is always kept in a ignited state, ensuring that the flame in the furnace body 70 will not be extinguished.

[0059] A manual valve 5 64 is provided between the other end of the auxiliary gas small pipeline 42 and the pipeline 2 51 , and the on-off of the pipeline 2 51 can be controlled by the manual valve 5 64 .

[0060] A manual valve 1 54 and a pressure valve are also provided at one end of the main gas pipeline 41. The pressure valve can display the internal pressure situation. The on and off of the gas can be manually controlled through the manual valve 1 54. A manual valve 2 55 is also provided at the other end of the main gas pipeline 41. A manual valve 3 56 is provided on the auxiliary gas pipeline 42. The manual valve 3 56 is located between the common output interface 44 and the ventilation pipeline 47. The size adjustment and the on and off of the gas in the pipeline can be manually controlled through the manual valve 2 55 and the manual valve 3 56, thereby further improving the safety performance.

[0061] It also includes an oxygen delivery machine 57, on which an input port 58 and an output port 59 for externally inputting oxygen are respectively provided. The output port 59 is connected to the pipeline 1 45 through the pipeline 3 60. In actual operation, the oxygen delivery machine 57 delivers oxygen into the pipeline 1 45 through the pipeline 3 60, and after mixing with the fuel gas in the pipeline 1 45, the oxygen is delivered into the furnace body 70, which can ensure the full combustion of the fuel gas and improve the utilization rate of the fuel gas.

[0062] One end of the pipeline three 60 is connected to the three-way valve 61, one end of the three-way valve 61 is connected to the pipeline one 45, the other end of the three-way valve 61 is connected to the pipeline four 62, the other end of the pipeline four 62 is connected to the ignition device 52 in the furnace body 70, and a part of the oxygen produced by the oxygen supply machine 57 will be sent into the ignition device 52 through the pipeline four 62 and mixed with the internal fuel gas to facilitate ignition.

[0063] A manual valve four 63 is provided between the pipeline three 60 and the pipeline one 45, and the manual valve four 63 can control the connection and disconnection between the three-way valve 61 and the pipeline one 45.

[0064] The low-fire switch 50 , high-fire switch 49 and main valve switch 48 are solenoid valves for realizing automatic control.

[0065] S1, close the power switches QF1 and QF2, press the start button SB1, the X4 input signal of the PLC is received, the PLC runs, the PLC output signal Y5, and at the same time Y6 is output, the Y0 output relays KA5, KA6, and KA1 are energized, the circulation fan, ignition fan, and main valve run at the same time, the PLC's Y3 output, the ignition valve opens, the PLC's Y10 output, and the variable frequency fan runs;

[0066] When the inverter reaches the ignition frequency, the PLC's Y4 outputs, the high-voltage package ignites, the furnace flame signal is input to the PLC through the flame controller, X10 is disconnected, the flame detection is successful, the PLC's Y4 has no output, and the high-voltage package loses power and ignition is completed.

[0067] The PLC's Y1 output, relay KA2 is energized, and the combustion valve works. When the furnace temperature reaches the set temperature, the PLC's X2 input, Y1 has no output, the combustion valve loses power, the furnace temperature drops to the lower limit temperature, and Y1 is output and works in a cycle again.

[0068] When PLC:

[0069] 1. X6 is connected, the circulating fan fails, all PLC outputs lose power and stop working.

[0070] 2. X7 is connected, the ignition fan fails, all PLC outputs lose power and stop working.

[0071] 3. The inverter fails, all PLC outputs lose power and stop working.

[0072] 4. When working normally, the flame detection connector 36 does not detect the flame signal, the PLC outputs all lose power and stop working.

[0073] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A combustion furnace, characterized in that: The invention comprises a furnace body (70), a circulation fan and a gas supply source are installed on one side of the furnace body (70), the circulation fan is connected to a motor, a gas delivery pipeline (71) is arranged on the inner peripheral side wall of the furnace body (70), a combustion device (72) is arranged on the other side of the furnace body (70), the gas delivery pipeline (71) is connected to the combustion device (72), the combustible gas is burned in the combustion device (72), the combustion device (72) comprises a mixing chamber (1) and a combustion chamber (2), the mixing chamber (1) and the combustion chamber (2) are connected by a plurality of air supply pipes (3), a gas connection pipeline (4) is arranged on the mixing chamber (1), and the combustion chamber (2) The invention comprises a main board (5), a side board (6) and a top board (7), a gas chamber being formed between the two main boards (5), the two sides of the two main boards (5) being connected to the side boards (6) respectively, a mounting hole (9) for mounting an ignition device (52) being provided on the side boards (6), a top board (7) being installed on the upper end of the main board (5), a plurality of evenly arranged vent holes (10) being provided on the top board (7), the vent holes (10) being connected to the air supply pipe (3), a plurality of evenly arranged gas holes (11) being provided on the main board (5), the diameter of the gas holes (11) close to the top board (7) being smaller than the diameter of the gas holes (11) far from the top board (7); The ignition device (52) comprises a main body mounting seat (21), the main body mounting seat (21) is connected to an oxygen delivery pipe (22), an ignition pipe (23) and a flame detection pipe (24) are respectively installed in the main body mounting seat (21), one end of the ignition pipe (23) is connected to an electronic ignition device, and the other end of the ignition pipe (23) is provided with an ignition needle (26), a gas delivery pipe (27) is arranged in the main body mounting seat (21), a gas mixing honeycomb (28) is installed at the end of the gas delivery pipe (27), and the gas mixing honeycomb (28) is arranged in the oxygen delivery pipe (22); A control pipeline assembly (65) is installed on the other side of the furnace body (70). The control pipeline assembly (65) includes a main gas pipeline (41) and a secondary gas pipeline (42). One end of the main gas pipeline (41) is provided with an input interface (43) for external gas connection. The other end of the main gas pipeline (41) is connected to one end of the secondary gas pipeline (42) and is provided with a common output interface (44). The common output interface (44) is connected to the gas connection pipeline (4) through a pipeline 1 (45). The middle part of the main gas pipeline (41) is connected to the middle part of the secondary gas pipeline (42). A ventilation pipe (47) is connected between the main gas pipe (41), one end of the main gas pipe (41) is provided with a main valve switch (48), the other end of the main gas pipe (41) is provided with a high-fire switch (49), the auxiliary gas pipe (42) is provided with a low-fire switch (50), and the low-fire switch (50) is located between the common output interface (44) and the ventilation pipe (47); a mixing cavity is formed in the gas mixing honeycomb body (28), and a plurality of ventilation holes (30) are respectively opened on the end surfaces of both sides of the gas mixing honeycomb body (28); one end of the gas delivery pipe (27) is connected to the gas mixing honeycomb body (28) and the gas mixing honeycomb body (28) is connected to the gas mixing honeycomb body (28). The oxygen delivery pipe (22) is connected to a honeycomb body (28); a gas mixing plate (31) is further arranged in the oxygen delivery pipe (22); the gas mixing plate (31) is located on one side of the gas mixing honeycomb body (28); a plurality of ventilation holes (32) are opened on the gas mixing plate (31); the gas holes (11) include a first gas hole (12) and a second gas hole (13); the first gas hole (12) is located at the upper end of the main board (5); the second gas hole (13) is located at the lower end of the main board (5); the diameter of the first gas hole (12) is smaller than the diameter of the second gas hole (13); the second gas hole (13) includes The main plate (5) has a large hole (14) and a small hole (15); the lower end of the main plate (5) is inclined outward, and an opening for air outlet is formed at the lower end of the main plate (5); the inclination angle of the main plate (5) is 30°-50°; ventilation plates (16) are respectively installed on both sides of the top plate (7), and a plurality of air holes (17) are opened on the ventilation plates (16); an outer cover shell (18) is also included, and the upper and lower ends of the outer cover shell (18) are both open, and the outer cover shell (18) is sleeved on the outer periphery of the mixing chamber (1) and the combustion chamber (2), and the ventilation plate (16) is located between the outer cover shell (18) and the top plate (7).

2. The combustion furnace according to claim 1, characterized in that: One end of the ignition pipe (23) passes through and is connected to a gas mixing honeycomb (28) and a gas mixing sheet (31); a gas connector (25) is provided on the main body mounting seat (21), and the gas connector (25) is connected to a gas delivery pipe (27); an oxygen inlet hole (33) is provided on the main body mounting seat (21); an oxygen outlet cavity (34) is formed in the main body mounting seat (21), and the oxygen outlet cavity (34) is connected to the oxygen delivery pipe (22).

3. The combustion furnace according to claim 2, characterized in that: The main body mounting seat (21) is provided with an ignition joint (35) and a flame detection joint (36); one end of the ignition joint (35) is connected to the ignition needle (26), and the other end of the ignition joint (35) is connected to the electronic ignition device; one end of the flame detection joint (36) is connected to the flame detection pipe (24), and the other end of the flame detection joint (36) is connected to the control detection cabinet; a visual window (37) is provided on the main body mounting seat (21); the ignition pipe (23), the gas delivery pipe (27), and the flame detection pipe (24) are arranged inside the oxygen delivery pipe (22).

4. The combustion furnace according to claim 1, characterized in that: The other end of the auxiliary gas small pipeline (42) is connected to the second pipeline (51), and the other end of the second pipeline (51) is connected to the ignition device (52) in the furnace body (70); a normally open gas switch (53) is provided between the other end of the auxiliary gas small pipeline (42) and the second pipeline (51); and a manual valve five (64) is provided between the other end of the auxiliary gas small pipeline (42) and the second pipeline (51).

5. The combustion furnace according to claim 4, characterized in that: One end of the main gas pipeline (41) is also provided with a manual valve 1 (54), the other end of the main gas pipeline (41) is also provided with a manual valve 2 (55), and the auxiliary gas pipeline (42) is provided with a manual valve 3 (56), and the manual valve 3 (56) is located between the common output interface (44) and the ventilation pipeline (47).

6. The combustion furnace according to claim 5, characterized in that: The invention also comprises an oxygen delivery machine (57), on which an input port (58) and an output port (59) for externally inputting oxygen are respectively arranged, and the output port (59) is connected to the pipeline one (45) through the pipeline three (60).

7. The combustion furnace according to claim 6, characterized in that: One end of the pipeline three (60) is connected to a three-way valve (61), one end of the three-way valve (61) is connected to the pipeline one (45), the other end of the three-way valve (61) is connected to the pipeline four (62), the other end of the pipeline four (62) is connected to the ignition device (52) in the furnace body (70); a manual valve four (63) is arranged between the pipeline three (60) and the pipeline one (45); the low-fire switch (50), the high-fire switch (49) and the main valve switch (48) are solenoid valves.

8. A control method, characterized in that: A combustion furnace according to any one of claims 1 to 7, having a PLC, when: The circulating fan fails, X6 is connected, all PLC outputs lose power and stop working; The ignition fan fails, X7 is connected, all PLC outputs lose power and stop working; The inverter fails, all PLC outputs lose power and stop working; When working normally, the flame detection connector does not detect the flame signal, the PLC outputs all lose power and stop working.

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